# Ultrasound

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• Created by: Simana
• Created on: 28-10-15 15:12
What is a Ultrasound?
A sound with a higher frequency than 20000Hz
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What can Electrical systems be used to produce?
Electrical Oscillations of any frequency
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What can Electrical oscillations be converted to?
Mechanical vibrations to produce sound waves
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What is Partial Reflection?
When a waves passed from one medium into another, some of the wave is reflected off the boundary between the two media, and some is transmitted (and refracted)
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What does that mean?
You can point a pulse of ultrasound at an object and wherever there are boundaries between one substance and another, some of the ultrasound gets reflected back.
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How can you measure how far away the boundary is?
By using the time it takes for the reflections to reach a detector
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How does ultrasound imaging work?
By using the time it takes for the reflections to reach a detector
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What can you use to find boundaries?
Oscilloscope Traces
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What does the Oscilloscope Trace show?
An ultrasound pulse reflecting off two separate boundaries.
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What is the Formula for finding the distance between the boundaries?
D(distance) = S(speed)X T(time)
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WHat do you need to make sure to do when using the formula?
Divide it by 2 as the wave has travelled there and back again.
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## Other cards in this set

### Card 2

#### Front

What can Electrical systems be used to produce?

#### Back

Electrical Oscillations of any frequency

### Card 3

#### Front

What can Electrical oscillations be converted to?

### Card 4

#### Front

What is Partial Reflection?

### Card 5

#### Front

What does that mean?